Display screen with a graphical user interface



FIGS. 1 and 2 are portrait and landscape face views of a display screen with a graphical user interface, showing our new design, according to a first embodiment thereof; and,

FIGS. 3 and 4 are portrait and landscape face views of the display screen with the graphical user interface, showing the new design, according to a second embodiment thereof.

Subject matter shown in broken lines is environmental and forms no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 